Julius schuncke



UNITED STATES PATENT OEErcE-x JULIUS SOHUNOKE, OFLUDVVIGSHAFEN-ON-THE-RHINE, BAVARIA, ASSIGNOR TO BADISOHE ANILIN & SODAFABRIK, OF MANNH-EIM, GERMANY.

AZO COLOR.

SPECIFICATION forming part'of Letters Patent No. 246,221, dated August23, 1881.

Application filed July 9, 1881.

To all whom it may concern Be it known that l, JULIUS SCHUNGKE, asubject of the King of Wiirtemberg, residing atLudwigshafen-on-the-Rhine, in the Kingdonl of Bavaria and Empire ofGermany,have

'invented new and useful Improvements in Dye-Stuffs or Coloring-Matters,of which the following is a specification.

This invention relates to the production of a garnet coloring-matter ordye-stuff suitable for dyeing and printing, which is capableot'replacing archil in some of its industrial applications, and whichmay be termed archilred.

This coloring-matter belongs to the class of the azo compounds,andresults from the action of the diazocompound ot' amidoazo-xylole upon analkaline solution of a bisulpho-acid of beta-naphthol.

In preparing the archil-red I mix ten parts of amidoazo-xylole withthirty parts of muriatic acid of a specific gravity of 1.151.17, andwith twenty parts of water, and then I gradually add, constantlystirring, at solution of two and one-half parts of nitrite of sodium infifty parts of water, and keep the mixture cold by the addition of ice.After standing one houra dark-brown solution of the diazo compound ofamidoazoqrylole results,

0 which I mix, constantly stirring and cooling,

with an alkaline solution of beta-naphthol bisulpho-acid and live partsof caustic soda in two hundred parts of water. Care is to be taken tomaintain the mixture during the whole (Specimens) operation alwaysalkaline. After mixing the 5 said solution of beta-naphtholhisulpho-acid, the dye-stuff or coloring-matter is precipitated in theform of a brownish paste. which is filtered, pressed, and purified bydissolvingitin hot water. From this solution it is precipi- 4o tatedwith common salt. After drying the archil-red is in the form of ablackpowderwith a green metallic luster. 'lhispowder isa sodium compound ofthe coloring-matterand soluble in water, and is suitabletordyeingaccord- 5 ing to the methods in use for the azo dyes. It dyeswool,silk, and cotton with garnet shades similar to archil. It dyes onlyin an acidulated bath, and does not turn red in an acidbath. Archil dyespurplein an alkaline-bath, and the color is changed into acertain red inan acid-bath.

What I claim as new, and desire to secure by Letters Patent, is-

As a new article of manufacture, the garnet 5 coloring-matter which Iterm archil-red, produced by the action of the diazo compound ofamidoazo-Xylole upon an alkaline solution of beta-naphtholbisulpho-acid, substantially as described, or by any other means whichwill produce a like result.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JULIUS SUHUNGKE. Witnesses:

O. GLAsER, A. HANSER.

